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-rw-r--r--ext/lv2/gstlv2.c132
-rw-r--r--ext/lv2/gstlv2.h3
2 files changed, 131 insertions, 4 deletions
diff --git a/ext/lv2/gstlv2.c b/ext/lv2/gstlv2.c
index d1e4d176..ecf3fbec 100644
--- a/ext/lv2/gstlv2.c
+++ b/ext/lv2/gstlv2.c
@@ -40,6 +40,7 @@
#include <glib.h>
#include <gst/audio/audio.h>
#include <gst/controller/gstcontroller.h>
+#include <gst/audio/multichannel.h>
#include "gstlv2.h"
#include <slv2/slv2.h>
@@ -67,8 +68,21 @@ SLV2Value integer_prop;
SLV2Value toggled_prop;
SLV2Value in_place_broken_pred;
SLV2Value in_group_pred;
+SLV2Value has_role_pred;
SLV2Value lv2_symbol_pred;
+SLV2Value center_role;
+SLV2Value left_role;
+SLV2Value right_role;
+SLV2Value rear_center_role;
+SLV2Value rear_left_role;
+SLV2Value rear_right_role;
+SLV2Value lfe_role;
+SLV2Value center_left_role;
+SLV2Value center_right_role;
+SLV2Value side_left_role;
+SLV2Value side_right_role;
+
static GstSignalProcessorClass *parent_class;
static GstPlugin *gst_lv2_plugin;
@@ -76,6 +90,51 @@ static GstPlugin *gst_lv2_plugin;
GST_DEBUG_CATEGORY_STATIC (lv2_debug);
#define GST_CAT_DEFAULT lv2_debug
+/** Convert an LV2 port role to a Gst channel positon */
+static GstAudioChannelPosition
+gst_lv2_role_to_position (SLV2Value role)
+{
+ /* Front. Mono and left/right are mututally exclusive */
+ if (slv2_value_equals (role, center_role)) {
+ /** WARNING: If the group has only a single port, this must be changed to
+ * GST_AUDIO_CHANNEL_POSITION_FRONT_MONO. This can't be done by this
+ * function because this information isn't known at the time it is used.
+ */
+ return GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
+ } else if (slv2_value_equals (role, left_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
+ } else if (slv2_value_equals (role, right_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
+
+ /* Rear. Left/right and center are mututally exclusive */
+ } else if (slv2_value_equals (role, rear_center_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_REAR_CENTER;
+ } else if (slv2_value_equals (role, rear_left_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_REAR_LEFT;
+ } else if (slv2_value_equals (role, rear_right_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT;
+
+ /* Subwoofer/low-frequency-effects */
+ } else if (slv2_value_equals (role, lfe_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_LFE;
+
+ /* Center front speakers. Center and left/right_of_center
+ * are mutually exclusive */
+ } else if (slv2_value_equals (role, center_left_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
+ } else if (slv2_value_equals (role, center_right_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
+
+ /* sides */
+ } else if (slv2_value_equals (role, side_left_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT;
+ } else if (slv2_value_equals (role, side_right_role)) {
+ return GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT;
+ }
+
+ return GST_AUDIO_CHANNEL_POSITION_INVALID;
+}
+
/** Find and return the group @a uri in @a groups, or NULL if not found */
static GstLV2Group *
gst_lv2_class_find_group (GArray * groups, SLV2Value uri)
@@ -87,6 +146,23 @@ gst_lv2_class_find_group (GArray * groups, SLV2Value uri)
return NULL;
}
+static GstAudioChannelPosition *
+gst_lv2_build_positions (GstLV2Group * group)
+{
+ int i;
+ GstAudioChannelPosition *positions = NULL;
+ if (group->has_roles) {
+ positions = malloc (group->ports->len * sizeof (GstAudioChannelPosition));
+ for (i = 0; i < group->ports->len; ++i)
+ positions[i] = g_array_index (group->ports, GstLV2Port, i).position;
+
+ // Fix up mono groups (see WARNING above)
+ if (group->ports->len == 1)
+ positions[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
+ }
+ return positions;
+}
+
static void
gst_lv2_base_init (gpointer g_class)
{
@@ -98,6 +174,9 @@ gst_lv2_base_init (gpointer g_class)
SLV2Value val;
SLV2Values values, sub_values;
GstLV2Group *group = NULL;
+ GstAudioChannelPosition position = GST_AUDIO_CHANNEL_POSITION_INVALID;
+ GstAudioChannelPosition mono_position = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
+ GstAudioChannelPosition *positions = NULL;
guint j, in_pad_index = 0, out_pad_index = 0;
gchar *klass_tags;
@@ -139,6 +218,7 @@ gst_lv2_base_init (gpointer g_class)
g.uri = slv2_value_duplicate (group_uri);
g.pad = is_input ? in_pad_index++ : out_pad_index++;
g.ports = g_array_new (FALSE, TRUE, sizeof (GstLV2Port));
+ g.has_roles = TRUE;
sub_values = slv2_plugin_get_value_for_subject (lv2plugin, group_uri,
lv2_symbol_pred);
if (slv2_values_size (sub_values) > 0)
@@ -151,6 +231,19 @@ gst_lv2_base_init (gpointer g_class)
group = &g_array_index (groups, GstLV2Group, groups->len - 1);
}
+ position = GST_AUDIO_CHANNEL_POSITION_INVALID;
+ sub_values = slv2_port_get_value (lv2plugin, port, has_role_pred);
+ if (slv2_values_size (sub_values) > 0) {
+ SLV2Value role = slv2_values_get_at (sub_values, 0);
+ position = gst_lv2_role_to_position (role);
+ slv2_values_free (sub_values);
+ }
+ if (position != GST_AUDIO_CHANNEL_POSITION_INVALID) {
+ desc.position = position;
+ } else {
+ group->has_roles = FALSE;
+ }
+
g_array_append_val (group->ports, desc);
} else {
@@ -184,17 +277,35 @@ gst_lv2_base_init (gpointer g_class)
/* add input group pad templates */
for (j = 0; j < gsp_class->num_group_in; ++j) {
group = &g_array_index (klass->in_groups, GstLV2Group, j);
+ if (group->has_roles) {
+ positions = gst_lv2_build_positions (group);
+ }
+
gst_signal_processor_class_add_pad_template (gsp_class,
slv2_value_as_string (group->symbol),
- GST_PAD_SINK, j, group->ports->len);
+ GST_PAD_SINK, j, group->ports->len, positions);
+
+ if (group->has_roles) {
+ free (positions);
+ positions = NULL;
+ }
}
/* add output group pad templates */
for (j = 0; j < gsp_class->num_group_out; ++j) {
group = &g_array_index (klass->out_groups, GstLV2Group, j);
+ if (group->has_roles) {
+ positions = gst_lv2_build_positions (group);
+ }
+
gst_signal_processor_class_add_pad_template (gsp_class,
slv2_value_as_string (group->symbol),
- GST_PAD_SRC, j, group->ports->len);
+ GST_PAD_SRC, j, group->ports->len, positions);
+
+ if (group->has_roles) {
+ free (positions);
+ positions = NULL;
+ }
}
/* add non-grouped input port pad templates */
@@ -205,7 +316,7 @@ gst_lv2_base_init (gpointer g_class)
const gchar *name =
slv2_value_as_string (slv2_port_get_symbol (lv2plugin, port));
gst_signal_processor_class_add_pad_template (gsp_class, name, GST_PAD_SINK,
- j, 1);
+ j, 1, &mono_position);
}
/* add non-grouped output port pad templates */
@@ -216,7 +327,7 @@ gst_lv2_base_init (gpointer g_class)
const gchar *name =
slv2_value_as_string (slv2_port_get_symbol (lv2plugin, port));
gst_signal_processor_class_add_pad_template (gsp_class, name, GST_PAD_SINK,
- j, 1);
+ j, 1, &mono_position);
}
/* construct the element details struct */
@@ -651,8 +762,21 @@ plugin_init (GstPlugin * plugin)
toggled_prop = slv2_value_new_uri (world, NS_LV2 "toggled");
in_place_broken_pred = slv2_value_new_uri (world, NS_LV2 "inPlaceBroken");
in_group_pred = slv2_value_new_uri (world, NS_PG "inGroup");
+ has_role_pred = slv2_value_new_uri (world, NS_PG "role");
lv2_symbol_pred = slv2_value_new_string (world, NS_LV2 "symbol");
+ center_role = slv2_value_new_uri (world, NS_PG "centerChannel");
+ left_role = slv2_value_new_uri (world, NS_PG "leftChannel");
+ right_role = slv2_value_new_uri (world, NS_PG "rightChannel");
+ rear_center_role = slv2_value_new_uri (world, NS_PG "rearCenterChannel");
+ rear_left_role = slv2_value_new_uri (world, NS_PG "rearLeftChannel");
+ rear_right_role = slv2_value_new_uri (world, NS_PG "rearRightChannel");
+ lfe_role = slv2_value_new_uri (world, NS_PG "lfeChannel");
+ center_left_role = slv2_value_new_uri (world, NS_PG "centerLeftChannel");
+ center_right_role = slv2_value_new_uri (world, NS_PG "centerRightChannel");
+ side_left_role = slv2_value_new_uri (world, NS_PG "sideLeftChannel");
+ side_right_role = slv2_value_new_uri (world, NS_PG "sideRightChannel");
+
parent_class = g_type_class_ref (GST_TYPE_SIGNAL_PROCESSOR);
gst_lv2_plugin = plugin;
diff --git a/ext/lv2/gstlv2.h b/ext/lv2/gstlv2.h
index fb384cce..85e4532e 100644
--- a/ext/lv2/gstlv2.h
+++ b/ext/lv2/gstlv2.h
@@ -64,11 +64,14 @@ struct _GstLV2Group {
guint pad; /**< Gst pad index */
SLV2Value symbol; /**< Gst pad name / LV2 group symbol */
GArray *ports; /**< Array of GstLV2Port */
+ gboolean has_roles; /**< TRUE iff all ports have a known role */
};
struct _GstLV2Port {
gint index; /**< LV2 port index (on LV2 plugin) */
gint pad; /**< Gst pad index (iff not part of a group) */
+ SLV2Value role; /**< Channel position / port role */
+ GstAudioChannelPosition position; /**< Channel position */
};
struct _GstLV2Class {
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-16 09:14:17 +0000